linux-kernel - Re: [tip:x86/urgent] x86-64, modify_ldt: Ban 16-bit segments on 64-bit kernels

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Message-ID: <CA+55aFy8s7cfaAXJ7WyJ4aMpBnsWGt2mA1=pduQwK+ofkvbzVg@mail.gmail.com>
Date:	Sat, 12 Apr 2014 14:53:56 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Borislav Petkov <bp@...en8.de>, Brian Gerst <brgerst@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	stable <stable@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: Re: [tip:x86/urgent] x86-64, modify_ldt: Ban 16-bit segments on
 64-bit kernels

On Sat, Apr 12, 2014 at 12:44 PM, H. Peter Anvin <hpa@...or.com> wrote:
> Run a 32-bit VM.  The 32-bit kernel does this right.

I really don't think that's the answer.

If people really run these 16-bit programs, we need to allow it.
Clearly it used to work.

Just make the unconditional "don't allow 16-bit segments" be a sysconf entry.

          Linus
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